<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片区域 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <!-- 表格 -->
      <tree-table class="treeTable" :data="catelist" :columns="columns" :selection-type="false" :expand-type="false" show-index index-text="#" border :show-row-hover="false">
        <!-- 是否有效 -->
        <template slot="isok" slot-scope="scope">
          <i class="el-icon-success" v-if="scope.row.cat_deleted==false" style="color:lightgreen"></i>
          <i class="el-icon-error" v-else style="color:red"></i>
        </template>
        <!-- 排序 -->
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level==0">一级</el-tag>
          <el-tag type="success" size="mini" v-else-if="scope.row.cat_level==1">二级</el-tag>
          <el-tag type="warning" size="mini" v-else>三级</el-tag>
        </template>
        <!-- 操作 -->
        <template slot="opt">
          <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
          <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
        </template>
      </tree-table>
      <!-- 分页区域 -->
      <el-pagination @size-change="handleSizeChange" @current-change="handleCurrentChange" :current-page="queryInfo.pagenum" :page-sizes="[3,5,15]" :page-size="queryInfo.pagesize" layout="total, sizes, prev, pager, next, jumper" :total="total">
      </el-pagination>
    </el-card>
    <!--添加分类的对话框  -->
    <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%" @close="addDialogClosed">
      <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px">
        <!-- 添加分类的表单 -->
        <el-form-item label="分类名称:" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <!-- 父集分类 -->
        <el-form-item label="父分类:">
          <el-cascader expand-trigger="hover" :options="parentCateList" v-model="selectedKeys" :props="cascaderProps" @change="paraentCateChanged" clearable change-on-select>
          </el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>

  </div>
</template>

<script>
export default {
  name: 'Cate',
  data() {
    return {
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5,
      },
      //商品分类的数据类表，默认为空
      catelist: [],
      //总数据条数
      total: 0,
      columns: [
        //为table制定列的定义
        {
          label: '分类名称',
          prop: 'cat_name',
        },
        {
          label: '是否有效',
          //表示当前列是否为模板列
          type: 'template',
          template: 'isok',
        },
        {
          label: '排序',
          //表示当前列是否为模板列
          type: 'template',
          template: 'order',
        },
        {
          label: '操作',
          //表示当前列是否为模板列
          type: 'template',
          template: 'opt',
        },
      ],
      //控制对话框分类的显示与隐藏
      addCateDialogVisible: false,
      //添加分类的表单数据对象
      addCateForm: {
        cat_name: '',
        //父id
        cat_pid: 0,
        //分类登记默认是一级分类
        cat_level: 0,
      },
      //验证规则
      addCateFormRules: {
        cat_name: [
          {
            required: true,
            message: '请输入分类名',
            trigger: 'blur',
          },
        ],
      },
      //父级分类父级列表
      parentCateList: [],
      //制定级联选择器的配置对象
      cascaderProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
      },
      //选中的父级分类的id数组
      selectedKeys: [],
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    //获取商品数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories', {
        params: this.queryInfo,
      })
      if (res.meta.status !== 200)
        return this.$message.error('获取商品分类失败')
      //数组给赋值
      this.catelist = res.data.result
      this.total = res.data.total
    },
    //监听pagesize改变的事件
    handleSizeChange(newSize) {
      this.querInfo.pagesize = newSize
      this.getCateList()
    },
    //监听pagenum改变
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    showAddCateDialog() {
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    //获取父级分类的数据列表
    async getParentCateList() {
      const { data: res } = await this.$http.get('categories', {
        params: { type: 2 },
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取父级分类失败')
      }
      this.parentCateList = res.data
    },
    //选择发生变化时候
    paraentCateChanged() {
      //如果selectedKeys数组中的length大于0证明选中的父集分类
      //反之就表示没有选中父级分类
      if (this.selectedKeys.length > 0) {
        this.addCateForm.cat_pid =
          this.selectedKeys[this.selectedKeys.length - 1]
        this.addCateForm.cat_level = this.selectedKeys.length
        return
      } else {
        //父集分类的id
        this.addCateForm.cat_pid = 0
        //当前分类的等级赋值
        this.addCateForm.cat_level = 0
      }
    },
    addCate() {
      //点击按钮添加新的分类
      this.$refs.addCateFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          'categories',
          this.addCateForm
        )
        if (res.meta.status !== 201) {
          return this.$message.error('添加分类失败')
        }
        this.$message.success('添加分类成功')
        this.getCateList()
        this.addCateDialogVisible = false
      })
    },
    addDialogClosed() {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_level = 0
      this.addCateForm.cat_pid = 0
    },
  },
}
</script> 

<style lang="less" scoped>
.treeTable {
  margin-top: 15px;
}
.el-cascader {
  width: 100%;
}
</style>